code: def is_exact_string(src: str, matches: "List[Match]"):
      return len(matches) == 1 and src == matches[0].group(0)
  
imports: import os
  import re
  import typing
  from collections.abc import Iterable, Mapping
  from functools import singledispatch
  from funcy import memoize, rpartial
  from dvc.exceptions import DvcException
  from dvc.utils.flatten import flatten
label_desc: Use image node_id 19 for calling a global function with example usage: is_exact_string(src, matches) and returns: unknown